Greater London Authority Act 1999

4 (1) If a person holds the office of Deputy Mayor on the date on which a vacancy in the office of Mayor occurs, that person shall be the acting Mayor unless, within the permitted period—

(a) he gives notice to the proper officer of the Authority that he does not wish to be the acting Mayor; or

(b) he does not give a notice under paragraph (a) above and does not deliver a declaration under paragraph 8(1) below.

(2) If a person becomes the acting Mayor by virtue of being the Deputy Mayor—

(a) he shall cease to be the Deputy Mayor; and

(b) he shall not be the Deputy Mayor, the Chair of the Assembly or the Deputy Chair of the Assembly at any time while he is the acting Mayor.

(3) If, by virtue of sub-paragraph (1) above, the person who is the Deputy Mayor does not become the acting Mayor, the proper officer of the Authority shall give notice of that fact to the Chair of the Assembly as soon as practicable after—

(a) receipt of any notice under sub-paragraph (1)(a) above; or

(b) if no such notice is given, the last day of the permitted period.

(4) Where notice is given to the Chair of the Assembly—

(a) under paragraph 2(1)(b) above, or

(b) under sub-paragraph (3) above,

the person who is the Chair of the Assembly shall be the acting Mayor.

(5) If a person becomes acting Mayor by virtue of being the Chair of the Assembly—

(a) he shall cease to be the Chair of the Assembly; and

(b) he shall not be the Deputy Mayor, the Chair of the Assembly or the Deputy Chair of the Assembly at any time while he is the acting Mayor.

(6) In this paragraph “the permitted period” means the period of seven days following the day on which notice under paragraph 2(1)(a) above is given to the Deputy Mayor.